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if a brick weighs 4pounds and half a brick then what does a brick and a half weigh ?

There was an old (probably first world war vintage) puzzle that went: "If a hen and a half laid an egg and a half in a day and a half, how many eggs would a rooster lay in a week?". That was, of course, the easy one. The harder variant went: "If a hen and a half laid an egg and a half in a day and a half, how many eggs would a hen (working at the same rate) lay in six days?"

Based on all of this, can you tell me then, how much milk is in a bar of Cadbury's Dairy Milk?

So, algebraically, one gets...R = the number of eggs laid by the rooster...E = the number of eggs laid in 6 days.H = the number of eggs that 1.5 hens lays in 1.5 d.So, it would be E =10xR + 4xH So...One must conclude E=6 eggs laid by one hen in 6 days.

From CliffordK:QuoteSo, algebraically, one gets...R = the number of eggs laid by the rooster...E = the number of eggs laid in 6 days.H = the number of eggs that 1.5 hens lays in 1.5 d.So, it would be E =10xR + 4xH So...One must conclude E=6 eggs laid by one hen in 6 days. so there are the Eggs and the Rooster, but the Rooster will lay 0 -- Rooster is the key, because when we cancel the lower case we arrive at ERR0Rand we can conclude that the answer must be 4 eggs, not 6!